/Engine/Plugins/AudioGameplayVolume/Source/AudioGameplayVolume/Public/AudioGameplayVolumeSubsystem.h
(Audio Thread Only) Add, Update, Remove ProxyVolumes
bool AddProxy ( [TWeakObjectPtr](API\Runtime\Core\UObject\TWeakObjectPtr)< [UAudioGameplayVolumeProxy](API\Plugins\AudioGameplayVolume\UAudioGameplayVolumeProxy) > WeakProxy )